<template>
  <div id="app">
    <keep-alive>
      <router-view v-if="$route.meta.keepAlive">
          <!-- 这里是会被缓存的视图组件，比如 presentation,page2 -->
      </router-view>
  </keep-alive>
  <router-view v-if="!$route.meta.keepAlive">
      <!-- 这里是不被缓存的视图组件，比如 page3 -->
  </router-view>
  </div>
</template>
<script>
export default {
  created() {
    // 全局的路由对象
    window.vueRouter = this.$router;
  }
};
</script>
<style>
#app {
  font-family: 'Avenir', Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-align: center;
  color: #2c3e50;
}
#nav {
  padding: 30px;
}

#nav a {
  font-weight: bold;
  color: #2c3e50;
}

#nav a.router-link-exact-active {
  color: #42b983;
}
</style>
